Hmm... I have never owned a blackberry so I wouldn't be able to test on it. However, there is one thing to verify: did you make sure your form has been enabled to be rendered on mobile devices?
1. Make sure your form is browser-compatible
2. Tools | Form Options, select "Browser" and make sure "Enable rendering on a mobile device" is checked.
Also, I believe not all controls will work on a mobile device. However, regular textboxes should always work.
Hope you can get your form to render properly,
Dave.
David Airapetyan / Software Services ArchitectQdabra® Software / Streamline data gathering to turn process into knowledge